diff --git a/prowler/CHANGELOG.md b/prowler/CHANGELOG.md
index f02c53ebeb..0e01c3878c 100644
--- a/prowler/CHANGELOG.md
+++ b/prowler/CHANGELOG.md
@@ -7,6 +7,7 @@ All notable changes to the **Prowler SDK** are documented in this file.
 ### Fixed
 - Fix typo `trustboundaries` category to `trust-boundaries` [(#9536)](https://github.com/prowler-cloud/prowler/pull/9536)
 - Store MongoDB Atlas provider regions as lowercase [(#9554)](https://github.com/prowler-cloud/prowler/pull/9554)
+- Store GCP Cloud Storage bucket regions as lowercase [(#9567)](https://github.com/prowler-cloud/prowler/pull/9567)
 
 ---
 
diff --git a/prowler/providers/gcp/services/cloudstorage/cloudstorage_service.py b/prowler/providers/gcp/services/cloudstorage/cloudstorage_service.py
index 1a67f7dd7e..8ef005b68d 100644
--- a/prowler/providers/gcp/services/cloudstorage/cloudstorage_service.py
+++ b/prowler/providers/gcp/services/cloudstorage/cloudstorage_service.py
@@ -77,7 +77,7 @@ class CloudStorage(GCPService):
                             Bucket(
                                 name=bucket["name"],
                                 id=bucket["id"],
-                                region=bucket["location"],
+                                region=bucket["location"].lower(),
                                 uniform_bucket_level_access=bucket["iamConfiguration"][
                                     "uniformBucketLevelAccess"
                                 ]["enabled"],
diff --git a/tests/providers/gcp/services/cloudstorage/cloudstorage_service_test.py b/tests/providers/gcp/services/cloudstorage/cloudstorage_service_test.py
index 0008265049..e28b71a73e 100644
--- a/tests/providers/gcp/services/cloudstorage/cloudstorage_service_test.py
+++ b/tests/providers/gcp/services/cloudstorage/cloudstorage_service_test.py
@@ -35,7 +35,7 @@ class TestCloudStorageService:
             assert len(cloudstorage_client.buckets) == 2
             assert cloudstorage_client.buckets[0].name == "bucket1"
             assert cloudstorage_client.buckets[0].id.__class__.__name__ == "str"
-            assert cloudstorage_client.buckets[0].region == "US"
+            assert cloudstorage_client.buckets[0].region == "us"
             assert cloudstorage_client.buckets[0].uniform_bucket_level_access
             assert cloudstorage_client.buckets[0].public
 
@@ -53,7 +53,7 @@ class TestCloudStorageService:
 
             assert cloudstorage_client.buckets[1].name == "bucket2"
             assert cloudstorage_client.buckets[1].id.__class__.__name__ == "str"
-            assert cloudstorage_client.buckets[1].region == "EU"
+            assert cloudstorage_client.buckets[1].region == "eu"
             assert not cloudstorage_client.buckets[1].uniform_bucket_level_access
             assert not cloudstorage_client.buckets[1].public
             assert cloudstorage_client.buckets[1].retention_policy is None